This work is devoted to the study of phase transitions in CsPbBr3 perovskite nanocrystals nucleated in borogermanate glass. Perovskite nanocrystals are obtained by bulk crystallization in a glass matrix. A series of glass samples with nanocrystals of different sizes is investigated. Upon heating, the temperature dependence of the 1S exciton intensity for the entire series of samples shows the presence of three phase transitions: in the range 130-150, 440-450, and 510-515°C. The first phase transition refers to the transition from a tetragonal to a cubic structure. The last phase transition is associated with the melting of the crystalline phase. The phase transition at 440°С is declared for the first time. Upon cooling, the temperature curve shows the presence of only one phase transition in the region of 330°C, which is associated with the crystallization onset of CsPbBr3 perovskite nanocrystals in glass matrix.
Photo-thermo-refractive glass is a promising material because it combines the properties of several monofunctional materials in it. These glasses can be doped with rare earth ions and can then be used for many practical applications. But the major problem is the low absorption coefficient. So, a lot of research has been done to grow silver nanoclusters and nanoparticles for improving the spectroscopic properties of rare-earth ions. In this study we present a way to transfer energy from silver clusters to Eu3+ ions in the PTR glass. These results can be used for developing warm white LEDs and down converters for solar cells.
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